Afterwards, he struggled for a while longer, switching to the method of casting cannon bodies using wax patterns from molds, which indeed solved the problem of the cannon's rough surface. The precision barely improved, but the cost skyrocketed, the process was complex, and among ten workers, not even one could handle this work. Additionally, it was impossible to cast large-caliber cannons, and production couldn't be increased at all.
Now, he is struggling with the iron mold cannon casting method and the steel drilling method for the interior, approximately advancing to the early to mid-Qing Dynasty level, but there are still many technical difficulties to be solved, which can't be resolved in a short time.
